body{
    padding:0px;
    margin:0px;
    background:#f7f7f7;
    text-align:center;
}
.head{
    width:900px;
    background:#4679bd;
    height:50px;
    margin:0 auto;
}
.install{
    width:840px;
    background:#fff;
    padding:10px 30px;
    margin:0 auto;
}
.install table{
    margin:0px;
    padding:0px;
    width:100%;
}
.install table th{
    background:#f6f6f6;
    border-top:1px solid #e8e8e8;
    border-bottom:1px solid #e8e8e8;
    text-align:left;
    padding-left:10px;
    font-size:13px;
    height:35px;
    color:#555;
}
.install table td{
    border-bottom:1px solid #e8e8e8;
    font-size:12px;
    height:40px;
}
.install table td input{
    border:1px solid #a0a0a0;
    height:25px;
}

.button-b{
    border:0px;
    background:#4679bd;
    cursor: pointer;
    color:#fff;
    width:100px;
    height:30px;
}